ch10-p104 - 104. We apply Eq. 10-12 twice, assuming the...

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104. We apply Eq. 10-12 twice, assuming the sense of rotation is positive. We have ω > 0 and α < 0. Since the angular velocity at t = 1 min is 1 = (0.90)(250) = 225 rev/min, we have ωωα 10 225 250 1 25 =+ ¡ = =− ta rev / min .
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